Factoring
0=x2-9x+18
6 and 3
0=x2+9
3 and -3
0=x2-5x-14
7 and -2
0=5x2-80
Take the square root; x = 4, -4
Simplify.
square root of 20
plus minus 2 times the square root of 5
0=x2+5x+4
-1 and -4
0=-2x2+32
4 and -4
0=x2-4x+4
2
0=2x2+2x-12
factoring or quadratic formula; x = -3, 2
simplify the square root.
square root of 288
plus minus 12 times the square root of 2
0=x2-6x+5
5 and 1
0=3x2-300
10 and -10
0=2x2-3x-5
5/2 and -1
0=x2+8x+15
factoring; x = -5, -3
simplify the square root.
square root of -64
8i and -8i
0=x2-64
8
0=(x+4)2-16
0 and 8
0=2x2-x-36
9/2 and -4
0=2x2+9x-2
quadratic formula; x = -7/2, -1
simplify the square root.
square root of -20
plus minus 2 times the square root of 5
0=2x2+8x-24
6, 2
0 = (x+2)2-16
2 and -6
13 = 2x2-7x
3.88 and -0.38
0=(2x+4)2-9
taking the square root; x = - 1/2, -7/2
simplify the square root.
square root of -100
10i and -10i